How this used car value estimate works
The calculator starts with the original sticker price—or a comparable new-car price when the original is unknown—and applies a broad age-retention curve. It then compares the odometer with an age-adjusted 12,000-mile-per-year baseline before applying condition and title-history adjustments.
Real market value still depends on make, model, trim, options, service history, accident history, season, and local supply. Consumer Reports notes that high mileage, damage, and reconditioning cost affect value and that no used-car price is exact. That is why the result is a range and the next step is a local comparable check.
Method note: broad depreciation heuristic, 12,000 miles/year neutral baseline, capped mileage adjustment, and explicit condition/title multipliers. Not tax, insurance, lending, or legal advice.